Nickel-grafted TUD-1 mesoporous catalysts for carbon dioxide reforming of methane
Nickel-grafted TUD-1 mesoporous catalysts for carbon dioxide reforming of methane
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DOI：
10.1016/j.apcatb.2010.01.016
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发表时间：
2010-04
影响因子：
22.1
通讯作者：
Xy Xian-Yang Quek;Dapeng Liu;Wei Ni Evelyn Cheo;Hong Wang;Yuan Chen;Yanhui Yang
中科院分区：
文献类型：
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作者：
Xy Xian-Yang Quek;Dapeng Liu;Wei Ni Evelyn Cheo;Hong Wang;Yuan Chen;Yanhui Yang
通过接枝、直接合成和浸渍等方法将镍活性位点引入到ud -1介孔分子筛中。采用粉末x射线衍射、n2物理吸附、h2程序升温还原、h2化学吸附、TG/DTA、程序升温加氢、拉曼光谱和透射电镜对样品进行了表征，以了解样品的理化性质。甲烷二氧化碳重整的催化实验表明，ni接枝的ud -1具有最高的催化活性和长期稳定性。进一步的研究表明，催化剂的催化活性、稳定性和碳的形成对金属镍的粒径高度敏感，而Ni活性位点的引入方式对其影响很大。接枝方法固有的强锚定效应被认为是镍颗粒尺寸小和催化性能提高的根本原因。
The nickel active sites were introduced into TUD-1 mesoporous molecular sieve via grafting, direct synthesis, and impregnation methods. These samples were characterized using powder X-ray diffraction, N2physisorption, H2temperature-programmed reduction, H2chemisorption, TG/DTA, temperature-programmed hydrogenation, Raman spectra and transmission electron microscope to give the insight of physicochemical properties. Catalytic tests probed by the carbon dioxide reforming of methane revealed that Ni-grafted TUD-1 exhibited the highest catalytic activity and long-term stability among these catalysts. Further studies implied catalytic activity, stability and carbon formation were highly sensitive to the metallic nickel particle size which was significantly affected by the introduction method of Ni active sites. Strong anchoring effect inherent to the grafting method was suggested to be the underlying reason for the small Ni particle size and improved catalytic performance.